By means of intermediate image immersing technology, the present invention has increased reflection Angle, reduced straight collimator core diameter and shortened straight collimator length.

本发明是借助中间像浸没的技术，增大反射角、减小直光管芯径，缩短直光管的长度。

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The current standard mainly establishes at the aim of short intermediate pile, the design method of the long and large diameter bored piles is less targeted and its applicability is not wide.

当前的规范主要是针对中短桩建立而成的，对于超长大直径钻孔灌注桩的设计，其针对性不强，存在适应性问题。

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